Door unit



E. T. JACKSON DooR UNIT Dec. fl, 1959 5 Sheets-Sheet l Filed Dec. 4,195e E. T. JACKSON Dec. l, 1959 DOOR UNIT 3 Sheets-Sheet 2 Filed Dec. 4,1956 E. T. JACKSON DOOR UNIT Y Dec.

3 Sheets-Sheet 3 Filed` Dec.'4'. 1195's /VVENTR fo'll//fz T JacksonUnited States Patent O 2,914,817 noon- UNrr y Edwin T. Jackson,Tallahassee, Fla.

Application December 4, 1956, Serial No. 626,210

9 claims. (c1. 20-11) l This invention pertains to door structures, andparticularly to prefabricated ready hung door units and door vstructuresnishecl with such units.

Objects of the invention are to provide an improved A-prefabricated doorunit and to simplify the structure of a finished door opening.

A further object is to provide, in a door-frame structure, improved`attachment means lfor attaching the jamb ings, in which:

Fig. 1 is an exploded perspective view of a door unit embodying theinvention;

Fig. 2 is an enlarged` fragmentary sectional view taken along line 2-2of Fig. 4 showing details of a `finished door structure;

Fig. 3 is a front elevation, partially broken away of a fragment of theupper left corner of the door unit of Fig. 1, representing steps in theinstallation of the unit in a rough door opening;

Fig. 4 is a view similar to that of Fig. 3 but taken with theinstallation completed;

Fig. 5 is an exploded perspective view showing a modiiied door unitstructure according to the invention and representing steps inthe-installation of the modied door unit in a rough door opening; and

Fig. 6 is a detail side elevational view on an enlarged scale of afragment of the modied door unit of vFig. 5.

As seen in Fig. 1 the preferred: embodiment of a door unit in accordwith this invention comprises a pair of solid jamb members 1 and 2joined at their upper ends by a header 3 and preattached to a suitabletrim strip 4. Door 5, shown exploded from the jamb members, ispreferably preattached by hinges, such as hinge 6 to K jamb member 2.The -unit is provided with a detachable 'the jamb member, as measuredwith' respect to the vertical jamb surface 8, is a small acute angle ofpreferably about 7 degrees, or between about 4 degrees and aboutdegrees. The angle between surfaces 8 and 10 should ybesuiiciently smallto prevent any raising of a wedge 12 ICC as a result of the applicationof forces to the jamb member in a horizontal direction when the wedge isin the position hereinafter shown and described in connection with Fig.4. Since jamb member 1 is intended for vertical positioning, the smallangle relating surface 10 to back face 8 of the jamb member willcorrespond to or be equal to the inclination of surface 10 from thevertical.

A respective wedge 12, 13 is provided for each of the mortises 9, 14which are out or set into each jamb member, and it will be understoodthat wedges 15, 16 and 17 it mortises in jamb member 2 correspondingpreferably precisely with the morti-ses, such as 9 and 14. of jambmember 1. Each wedge is proportioned substantially to fill itsrespective mortise opening and, in the preassembled unit, as shipped tothe eld and in the condition in which the jamb members are firstintroduced into the rough door opening which it is desired to finish,the wedges are held in place in their respective mortises, as laterdescribed, to have their outer vertical faces, such as Iface 19 of wedge12, nearly flush with back jamb surface 8 or protruding from suchsurface by a small fraction of an inch, such as about 3/16 or 1/10 of aninch.

Fig. 2 shows in horizontal section a portion of the installed nishstructure, taken generally along line 2-2 of Fig. 4. lamb member 1 isrigidly and securely fixed in desired plumb position with respect toface 26 of buck 23 by means of Wedge 12. The wedge has been sliddownwandly in its mortise opening 9, from` the position of Fig. 3, andhas its vertical outer or front face 19 engaged flat against buck face2-6. Trim strip 4, which in the preassembled or prefabricated unit hasbeen permanently preaxed to jamb member 1 .at its outer edge 4 by meansof nails such as nail 20, lies against and is fastened to wall 21 bynail 22. Flat head wood screw 18 has its shank 31 extending throughvertically extending slot 32 and threadedly engaged in wedge 12. Screwhead 59 is engaged against the jamb member to hold wedge 9 to the jamb.Trim strip 7 has been applied to the opposite outer edge 1" of the jambmember 1 Iand affixed thereto during the installation procedure bynails, such as nail 29, and it is also attached to -the wall by nailssuch as nail 30. Nail 24 passes through the jamb member 1, through wedge9 and into buck 23 and serves to hold the jamb member Iagainst movementaway from the face of the buck, from which the member is spaced by wedge12, and against movement in any direction parallel to the buck face 26,and it further serves to prevent any movement of the wedge from its nalposition.

It Will be noted that wedge 12, and opening 9, are centeredsubstantially midway between the outer edges 1" `and 4 of the jamb, anditwill also be seen that wedge 12 is exposed through slot 32 to thefront face 25 of the jamb, being visible therethrough, and being movablyadjustable therethrough primarily through the medium of screw 18, untilanchored by nail 24. The accura-te locating of nail 24 is facilitated byvisibility of the wedge. The position of screw 18, which is attached tothe wedge, also furnishes a useful guide for the carpenter in locatingnail' 24 in position tov pass through the Wedge.

Slot 32` is seen yto extend through the jamb in a direction at rightangles to the -faces 25 and 8 of the jamb, or parallel to the wall 21.

Finally, door stop 27 is applied in position to cover slot 32, screwhead 59, and a nail 24 and is fixed to the jamb member by smallfinishingnails, such as nail 2S, tocomplete the installa-tion.

Further details of the prefabricated unit before ins tallation and ofthe structure resulting from installation of the unit are shown in Figs.3 and 4. As seen in Fig. 3, jamb member 1 has been `inserted into therough door opening, trim strip 4 being attached to the ljamb member, andthe j amb member has been properly plumb'ed and aligned with -respect tobuck face 26. The jamb member may, at this point, be held in thisposition by nailing of trim strip 4 by nails 22 as shown in Fig. 2, suchholding of the jamb members in position being of suicient strength topermit the lfurther installation steps to be taken without disturbingthe alignment of the jamb member but being insufiiciently strong toprovide permanently secure mounting of the members.

As seen in Fig. 3, screw 18 is disposed near the upper end '71D of slot32 and is threaded into Wedge 9 adjacent its upper end 75 as the unit ispreassemblcd and shipped to the field and as the unit is introduced intothe rough door opening. The slot 32 may open into a slight bevel '76adjacent jamb mem-ber face 34 to receive screw head 59 and thereby topermit screw head to lie flush with face 34, although, if the jambmember 1 is of soft wood, it has been found unnecessary to bevel theslot since the lmere tightening of the screw tends to sink the head intothe slot sufiiciently to bring the head flush with face 34. The screw,in the position of Fig. 3, serves to hold the wedge 12 substantiallycompletely housed in raised position within mortise opening 9, thevertical outer face 19 of the wedge being ush with, or aligned afraction of an inch outwardly of, back face 3 of the jamb member.

With the jamb member now in desired position, screw 18 is unscrewed fromwedge 12 permitting the wedge to move downwardly along wedge surface 11iof mortise 9. The screw is loosened a suflicient distance to permit thewedge to engage against the buck face 26, taking up the necessary spacebetween jamb face 8 and buck face 26, and the screw is then tightened asnecessary to bring its head again flush with jamb front surface 314. Thewedge and screw will now be in the positions of Fig. 4, the verticalwedge face 19 being in contact against buck face 26 and the inclinedwedge face 33 being held by screw 18 firmly against wedge surface 10 ofmortise 9. Nail 24 is now driven through jamb member 1 just to one sideof slot 32, through wedge 12 and into buck face 26, the preferredposition and direction of nail 24 being shown by a comparison of Figs. 2and 4.

The installation of the solid jamb unit is completed by application oftrim strip 7 against the exposed edge 1" of the jamb member and thenailing of the trim strip by nails 29 and 30 to the jamb member and tothe wall, respectively, and by the placing of door stop 27 in positionto cover slot 32, nail 24 and screw head 59, as shown in Figs. 2 and 4.

It will be understood that the arrangement in connection with each ofthe wedges 13, 15, 16, 17 and its respective mortise opening, such asopening 14, is preferably identical to that specifically shown anddescribed in connection with wedge 12 and mortise opening 9 at the upperend portion 1 of jamb member 1, and that each wedge is positioned andlocked in place in turn prior to application of trim strip 7 and stopmember 27. It will also be understood that checking or adjustment of theplumb position of the jamb may be made at several stages in theinstallation, and, before nail 24 is driven, for example, screw 18 maybe loosened and the position of wedge 12 altered as necessary to correctany slight misalignment. It will be apparent that screw 18 and slot 32permit small adjustments to be made to the wedge position even with bothtrim strips 4 and 7 in place if such adjustments become necessary,although only small adjustment is possible in this manner depending uponthe security of nailing of the trim strips. Substantial adjustments maybe accomplished, however, by loosening the trim strip wall anchor nailssuch as nail 30 without removing the trim strips from the jamb member,assuming that nails 24 have not been driven or have been removed.

The door unit as shown in Fig. 1 when preassembled for delivery to thebuilding site preferably has all of the wedges firmly held in place intheir respective mortise openings, by means of respective screws, suchas screw 18, arranged as shown in Fig. 3. Trim strip 4 for one face ofthe door opening is permanently attached to the jambs 1 and 2 and toheader 3 at the factory, the jambs are permanently attached to theheader, while trim strip 7 and door stop 27 are removably tacked inplace by means, for example, of partially driven finishing nails, suchas nails 29 and 37, and nails 3S, respectively.

The extreme thickness of wedge 12 measured along upper side edge may be,for contemporary construction, between about three-quarters of an inchto about one inch and this maximum wedge thickness is preferably greaterby a small fraction of an inch than the maximum depth, as measured alongupper wall 36, of mortise 9. The mortise is set into a jamb member 1which may have a thickness of about three-quarters of an inch to aboutone inch, but the mortise depth should be slightly less than such jambthickness to avoid cutting through the jamb. Speciically, in anexemplary construction, wherein the thickness of the jamb member isthree-quarters of an inch and the maximum thickness of the wedge isthreequarters of an inch, the depth measured along wall 36 of themortise may be between five-eighths and twentyone thirty-seconds inch,whereby the surface 19 of the wedge will lie, with the wedge housed inthe mortise, up

to about one-eighth inch outwardly of jamb surface S. Such constructionwill take care of all usual departures from the normal standard ofone-half inch clearance between the jamb and rough buck. For example,the wedge, as so proportioned, will adjust for a spacing of from aboutone-sixteenth or one-eighth of an inch up to a spacing of three-quartersof an inch.

The modied construction of Fig. 5 is applicable to split jamb door unitswherein a door 40 is ready hung by hinges, such as hinge 41, to a jambmember 42, which, with jamb member 43, constitutes the finish jamb forthe hinge side of the structure. The finish jamb for the opposite orlock side of the structure comprises upright split jamb members 44 and45. lamb members 42 and 44 are connected by a header member 46 and havea trim strip 47 preferably permanently atiixed thereto along outer edgethereof during prefabrication of the door unit. Jamb members 43 and 45are also joined by a header member similar to member 46 but not visiblein the drawing, and trim strip 48 is permanently preamxed to these jambmembers along outer edges S4 thereof and to the header member. Removabledoor stop members 49 are supplied with the Prefabricated unit,preferably tacked in place to the jamb members by partially driven nails76 for convenient removal from the unit at the site. The jamb comprisingmembers 44 and 45 is, as shown, split or divided along a linerepresented by edge 56 of member 44 and edge 51 or member 45, the linepassing through, and preferably approximately bisecting wedges surfaces,such as the surface divided into and consisting of wedge surface portion52 of member 44 and complementary wedge surface portion 53 of member 45.The wedge surface comprising the portions 52 and 53 is provided by amortise opening 54, 5S entering into the back face 56, S7 of the jamb44, 45.

Mortise opening portion 61 of jamb member 45 is aligned with mortiseopening portion 60 and, when edges 50 and 51 are brought into proximity,such as in preparation for shipment or upon final installation of theunit, mortise openings 69 and 61 constitute aligned portions of amortise originally formed, for example, by a single mortising cut madebefore splitting the respective jamb into the two jamb members 44, 45.Wedge 62 is shown in exploded position in Fig. 5, as are the wedges,such as wedge 63, for seating in mortise openings, such as opening 64,of the hinge side jamb members 42, 43.

Respectively similar mortise opening portions 54, 60 and 77 are arrangedalong jamb member 44, and respective corresponding complementary mortiseopening portions 55, 61 and 74 are provided in jamb member 45, andrespective wedges 62, 53 and 711 are shipped with ltheunit fordisposition in the mortises upon installation. Wedges such as wedge 63are also included for disposition in mortise openings in. jamb members42 and 43,

` such as `the opening comprising portion 64 in member 42.

AIt will be understood that the wedge and mortise arrangement of jambmembers 42 and 43 duplicates that of members 44 and 45. While threewedges are shown for each side ofthe door unit, two such wedges at eachside .may be suicient, or more than three may be desired for heavydoors, for example.

To install the split jamb unit of Fig. 5, door stop 49 is separated fromthe jamb members, and assembly 65, `comprising split jamb members 42 and44, door 40 hingedly attached to member 42 and trim strip 47 is `placedin position in the rough door opening in the wall represented by brokenlines 67. The assembly is plumbed and aligned in the door opening andtrim strip `47 is nailedl to the wall surface by nails such as nail 68.A `space 69 will exist between the face of the rough buck .of Vwal167and the back face 56 or jamb member 44. A-wedge is now placed inposition in one mortise opening portion in raised or housed positiontherein as is indicated by the position yolf wedge 58 in opening portion60. The wedge is then pelrnitted to fall in its opening portion, `beingguided by the hand of the carpenter if desired, .until it reaches theposition represented by wedge 71, with the vertical outer face 78engaged flat and firmly against the buck of wall 67, the wedge being nowdisplaced downwardly from its upper housed position in -the mortiseopening portion and being, of course, also in iirm engagement againstinclined wedge surface 72 of rvthe mortise opening. Nail 73 is nowdriven through the -jamb member and through the wedge into the buck.This procedure is repeated for each wedge of each jamb member 44, 42, 43and 45. With each wedge now in position and nailed by a nail 73 as shownfor wedge 71, `split jamb assembly 66, comprising jamb members 43 and 45andthe thereto aixed trim strip 48, is moved into the door opening.Since mortise opening portions, such as 55, 61 and 74, of the jambmembers 43 and 45 correspond precisely with mortise opening portions ofthe jamb members of assembly 65, assembly 66 will become exactly alignedwith assembly 65 ask the mortise opening portions of assembly 66 becomeengaged with the wedges. Thus, inclined wedge surface portion 79 ofmortise opening portion 74 cornes into precise alignment with surfaceportion 72 when it engages wedge 71, and surface portion 53 of mortiseopening portion 55 becomes in the `same manner exactly aligned withsurface portion 520i mortise opening portion 54 against wedge 62, whileopening portions 60 and 61 align against wedge 53. Accordingly, when allof the Wedges have been secured properly to` hold jamb members 42 and 44in plumb positions, jamb assembly 66 is merely advanced into the roughopening until its trim strip 48 engages the wall 67, and thenl it, too,is nailed, by nails corresponding to nail 73, y through the jamb members43 and 45 and through the wedges into the buck, and by nails 8) toattach the trim `strip to the wall. Edges 5d and 5l of jamb member 44and 45, respectively, will be spaced apart in accord with thevariablewall thickness, and it will be noted that the wedges are visible throughthis space permitting the carpenter accurately to determine the correctpositions for rthe nails to be driven through jamb members 43 and 45 andthrough the respective wedges into the buck. A nail sodriven is shown at81 in Fig. 6 as later described.

wedge 7l. and showing the backufaces 56 and 57 of jamb members 44 and45, the parts being in the positions assumed upon completion of theinstallation. The wedge 71 is seen to be located below its uppermost orhoused position in mortise opening 77, 74 and is seen to span betweenthe jamb members, being substantially centered between outer jamb edges84 and 85. Nails 73 and 81, pointing toward the viewer in Fig. 6, aredriven close to the' edges 50 and 51 of their respective jamb membersand passing through the wedge 71, thereby anchoring the jamb members tothe wedge and the wedge to the buck. The space between jamb edges 50 and51 is such as required to accommodate the wall thickness between trimstrips 47 and 48, and this space comprises a continuous vertical slotseparating split jamb member 44 from split jamb member 45. The slotextends in a direction perpendicular to the front and back faces of thejamb, or

yparallel to the wall 67, and each wedge is exposed to the front face ofthe jamb, such as face 82, 83, through the space or slot defined betweenthe inner edges of the split jamb members, permitting visibility of thewedge, for example, while driving nail 81.

The widths of the wedges and of the mortise opening are such that thewedge will enter both mortise opening portions 77 and 74 for a wall ofmaximum thickness of about ve and three-eighths inches, and that thewedge will not prevent the jambs to be brought closer together as for awall thickness of about four and three-eighths inches. If the jambmembers are, for example, two

inches wide, the mortise opening portions may extend approximately oneinch across the face 56 and across the face 57 from the edge 50 or 51,respectively, and if the wedge is then two and three-eighths inchesWide, edges 50 and 51 may approach to within three-eighths of an inch ofeach other, while for a maximum thickness wall, with edges 50 and 51separated by one and threeeighths inches, the wedge would be engagedone-half into each mortise opening portion. If desired, however, thewedges may be up to about three and three-eighths inches ywide and,being preferably of wood, may be quickly sawed off to a less thicknessat the site before installation if thinner walls are to be accommodated.

y Door stop 49 is seen to be nailed in place, by nails 76, to jambmembers 44 and 45, covering the space between edges 50 and 51 andcovering nails 73 and 81.

The solid jamb door unit of Figs. l-4 is particularly adapted for use inconstruction wherein the wall thickness is known and is the samethroughout a substantial number of door openings, as, for example, in ahousing project involving a number of similar dwellings, whereas thesplit jamb door unit of the modification shown in Figs. 5 and 6 is moresuitable for stocking by millwork suppliers for individual sales ofsmall numbers of door units, whereinthe wall thickness may vary asbetween plywood surfaced, dry wall and plaster constructions.

It will be seen that the elements, i.e. the wedges, which rigidly x thejamb positions in both of the constructions herein shown areself-adjusting, and that once the door jambs are properly plumbed in theopening, no fitting, measuring or adjusting steps are required tocomplete the installation, in either the solid jamb construction or inthe split jamb construction. It will be further recognized that, in thesplit jamb construction, the wedges serve to What is claimed as new andwhat it is desired to secure by Letters Patent of the United States is:

l. A door structure comprising a nished jamb, said jamb having a backface and a front face and having a mortise opening formed in said backface, said opening being wedge-shaped and being in part defined by anupwardly extending inner wall inclined inwardly into said jamb, adownwardly pointing wedge disposed in said mortise opening and having aface in contact with said inner wall of the opening, said jamb havingopposite outer edges, a respective trim strip amxed along each said jambedge, said mortise opening and said wedge therein being substantiallycentered between said outer edges, said jamb being vertically slotted toprovide a slot substantially midway between said outer edges extendingthrough said jamb in a direction perpendicular to said faces thereof andopening through said inner wall to expose through said slot a portion ofsaid wedge to said front face of said jamb whereby said wedge isaccessible for aligning said jamb in the rough door opening when thejamb is in place therein.

2. In a ready hung door unit having an upstanding jamb with a back facefor disposition toward the face of the rough buck and having a frontface, the combination of said jamb comprising a plurality of wedgesurfaces therein aligned one above the other, each said wedge surfacebeing formed as the inner wall of a respective wedge shaped mortise setinto said jamb through said back face thereof and each said wedgesurface extending in a straight line and at a predetermined small angleto said back face upwardly and inwardly from a lower edge at said backface into said jamb, a plural-ity of tapered wedges having major wedgesurfaces separated by substantially said predetermined angles disposedrespectively in said mortises, said jamb being slotted to expose eachsaid wedge to the front face of the jamb whereby each of said wedges `isaccessible for adjusting the spacing at each wedge between the jamb andthe rough buck when the jamb is in place in the rough door opening.

3. The combination according lto claim 2 wherein a respective screw `isprovided for each said wedge threadedly engaged in lits respective wedgeand extending through said slot, each said screw having a head at saidfront face and retaining the respective wedge in its said mortise.

4. In a prefabricated door unit, a jamb member a back face, a wedgesurface inclined upwardly into said jamb member from a meeting line withsaid back face, said surface having an angle of inclination to said backface of between about 4 and about l5 degrees, said wedge surfaceconstituting the inner wall of a mortise opening set into said jambthrough said back face thereof, a downwardly pointing wedge in saidopening engaging said surface, said jamb having a slot therethroughlocated to extend vertically along said wedge surface, and a screwextending through said slot and threadedly engaged in said wedge.

5. In a ready hung door unit having an upstanding jamb with a back facefor disposition toward the face of the rough buck, the combination ofsaid jamb comprising a plurality of wedge surfaces therein aligned oneabove the other, each said wedge surface being formed as the inner wallof a respective wedge shaped mortise set into said jamb through saidbackface thereof and each said wedge surface extending in a straightline and at a predetermined small angle to said back face upwardly andinwardly from a lower edge at said back face into said jamb, said jambbeing divided into two separate split jamb members along a vertical linepassing through each of said wedge surfaces whereby each said split jambmember' comprises a portion of each of said surface, and a plurality oftapered wedges having major wedge surfaces separated by substantiallysaid predetermined angles disposed respectively in said mortises andeach said wedge being proportioned to engage along one of its majorfaces both of said surface portions of the respective mortise and whenthe unit is installed Vto span between said split jamb members.

6. A prefabricated door unit comprising a solid jamb member havingopposite outer edges and front and back faces, a trim strip permanentlyafhxed to one said edge, a trim strip removably attached to the othersaid edge, a door stop removably attached to said front face, a doorhingedly attached to said front face, a vertically elongated slotextending through said jamb member substantially midway between saidedges and in a direction substantially perpendicular to said faces, ascrew having a head substantially flush with said front face and havinga shank extending generally horizontally through said slot, said backface comprising a restricted planar surface portion which is inclined bya small angle to the vertical, a wedge having a first face which lies ina vertical plane parallel to the plane of said front face and having asecond face inclined from said vertical plane and lying ush against saidrestricted surface portion and slideably vertically therealong, saidslot opening through and extending along said restricted surface portionin an upward and downward direction, said screw being threaded into saidwedge through its said inclined face and maintaining said inclined facethereof in selected upwardly and downwardly adjustable position againstsaid restricted Surface portion, said door stop being disposed incovering relation to said slot and screw head at said front face.

7. A Prefabricated door unit comprising a solid jamb member havingopposite outer edges and front and back faces, a trim strip permanentlyaffixed to one said edge, a trim strip removably attached to the othersaid edge, a door stop removably attached to said front face, a doorhingedly attached to said front face, an elongated slot extendingthrough said jamb member in a direction substantially perpendicular tosaid front faces and having opposite corresponding elongated openingsthrough said front and back faces, said back face having a restrictedsurface portion through which said slot opens and which is inclined by asmall angle out of parallelism with said front face in the direction inwhich said slot opening therein extends, a wedge having major facesrelated to each other by said small angle and having one said faceengaged ilat against said restricted surface portion, `and a screwhaving a head at said front face and a shank passing through said slotand threadedly engaged in said wedge through said one face thereof, saidwedge being oriented on said restricted surface portion in a directionto dispose its other said major face parallel to said front jamb faceand being movable along said restricted surface portion to vary thespacing between said lfront face and said other major face and beinglockable in selected position along said restricted surface portion bytightening of said screw.

8. In a door structure, the combination of a plurality of small anglewedges, a jamb having a back face and a front face, each said wedgehaving one major face thereof engaging a respective portion of said backface, said jamb being plurally slotted therethrough to provide varespective elongated rear slot opening extending along each said backface portion, each said slot having a corresponding front openingthrough the front face of the jamb, and a respective screw for each saidwedge threaded into the wedge through its said one major face and eachscrew extending through a respective said slot and having a headengaging said jamb at said front face thereof, each said screw beingslideable along its respective slot thereby to slide its respectivewedge along the respective said back face portion and each said screwbeing tightenable by screwing into said wedge thereby to anchor therespective wedge -in adjusted position against its respective back faceportion, a door buck having a respective face portion facing and spacedfrom each respective said back face portion and forming therewith arespective pair of facing face portions having a respective said wedgeinterposed therebetween, one said face portion of each said pair beinginclined by a small angle out of parallelism with the plane of the otherface portion of the pair.

9. In a closure frame for finishing a rough wall opening, a respectivepair of split jamb members for each side of the opening, said jambmembers having respective inner edges for disposition toward andadjacent each other within said opening at each side ,thereof and eachspaced from the corresponding respective rough buck face, a plurality ofwedges, each said jamb member of each said pair having a mortise openingthrough its said inner edge and forming a wall extending upwardly intothe member from, and at a predetermined angle to, its back face andintersecting said back face in a horizontal line, at least one of saidmortise openings of one of said jamb members yat each said side beingaligned with a corresponding one of said mortises in the other said jambl member at that side, a respective one of said wedges being disposed insaid one mortise opening of said one jamb member at each side andextending beyond said inner edge thereof'toward said other jamb member,the major faces of each wedge being related by said predetermined angleof the respective mortise and being engaged respectively flat againstthe respective buck face and the respective mortise wall, means liningsaid one jamb member rand said one wedge at each side rigidly to therespective buck whereby said wedges form positioning guides enteringsaid respective aligned mortises for said other jamb members, and meansto X said other jamb members to said Wedges.

References Cited in the le of this patent UNITED STATES PATENTS2,186,458 Lehman .l an. 9, 1940 2,651,814 Lester Sept. 15, 19532,753,602 Ringle July 10, 1956 2,781,559 Savoie Feb. 19, 1957

